Pure Substances vs. Mixtures

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its individual properties. Examples include air and salad.

Front

What happens to the properties of substances when they form a mixture?

Back

They retain their individual properties.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. Example: Ammonia (NH3).

Front

How can compounds be separated into simpler substances?

Back

Compounds can be changed into simpler substances by chemical changes.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the components are not uniformly distributed, and different parts can be seen. Example: A salad.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the components are uniformly distributed, and it appears the same throughout. Example: Saltwater.

Front

Can mixtures be separated?

Back

Yes, mixtures can be separated by physical means such as filtration, distillation, or magnetism.

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice into water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is rust forming on iron.